Answers.Body: <p>This looks like a <a href="https://brickset.com/parts/design-3956" rel="noreferrer">PLATE 2X2 ANGLE</a>, which is broken. There is a rough side shown on the picture.</p>
  
  <p><a href="https://i.sstatic.net/8IyvB.jpg" rel="noreferrer"><img src="https://i.sstatic.net/8IyvB.jpg" alt="enter image description here"></a></p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2017-08-28T03:08:36.777Z
Answers.Text: Looks like it was intentionally smoothed a bit after cutting or breaking, possibly for some one-off custom purpose.
Answers.UserDisplayName: Russell Borogove
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2017-08-28T08:51:55.773Z
Answers.Text: @RussellBorogove: I have lots of parts that are 30-40 years old that have a broken edge that is now rounded because it was in use for so long
Answers.UserDisplayName: PlasmaHH
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2017-08-28T10:19:50.463Z
Answers.Text: Huh, I thought it was familiar. Good job!
Answers.UserDisplayName: Ambo100
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2017-08-29T20:41:49.547Z
Answers.Text: Sorry for the delay--there is indeed a Lego part number on the bottom, which is 3956. On closer inspection, I think the above comments are right--the broken edge is not completely flat, but rounded! No wonder I couldn't find this in Bricklink.  Thanks to all!
Answers.UserDisplayName: sampoerna quatrain
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2017-08-28T00:18:27.437Z
Answers.LastActivityDate: 2017-08-28T23:56:01.343Z
Answers.LastEditDate: 2017-08-28T23:56:01.343Z
Answers.UserDisplayName: Joost
Body: <p>Once again, I need the collective wisdom of this group to identify a mystery LEGO element! </p>
  
  <p>I did a search for "2x2"and went through scores of Bricklink pages, but I couldn't find this particular piece. </p>
  
  <p>It's the size of a 2x2 plate, but with this added grooved part that I've never seen before.</p>
  
  <p><a href="https://i.sstatic.net/3yArG.jpg" rel="noreferrer"><img src="https://i.sstatic.net/3yArG.jpg" alt="enter image description here"></a></p>
  
  <p><a href="https://i.sstatic.net/9QqyR.jpg" rel="noreferrer"><img src="https://i.sstatic.net/9QqyR.jpg" alt="enter image description here"></a></p>
  
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2017-08-27T23:27:47.323Z
Comments.Text: Can you find a number anywhere on the bottom of the brick? [I can just about make up something that looks like '90-7' but I'm not sure.](http://i.imgur.com/zVSFaBd.png)
Comments.UserDisplayName: Ambo100
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2017-08-28T05:11:35.343Z
Comments.Text: @Ambo100 I think it's "4-06" upside down?
Comments.UserDisplayName: Adeptus
Tags: <part-identification>
Title: What is this piece slightly longer than a 2x2 plate with grooves and a hole?
UserDisplayName: sampoerna quatrain
ThreadText: # What is this piece slightly longer than a 2x2 plate with grooves and a hole?
  
  (Asked by: username_0 on 2017-08-27)
  
  Once again, I need the collective wisdom of this group to identify a mystery LEGO element!
  
  I did a search for "2x2"and went through scores of Bricklink pages, but I couldn't find this particular piece.
  
  It's the size of a 2x2 plate, but with this added grooved part that I've never seen before.
  
  [![enter image description here](https://i.sstatic.net/3yArG.jpg)](https://i.sstatic.net/3yArG.jpg)
  
  [![enter image description here](https://i.sstatic.net/9QqyR.jpg)](https://i.sstatic.net/9QqyR.jpg)
  
  **Tags:** part-identification
  
  > **Comments:**
  > **username_1**: Can you find a number anywhere on the bottom of the brick? [I can just about make up something that looks like '90-7' but I'm not sure.](http://i.imgur.com/zVSFaBd.png)  
  > **username_2**: @username_1 I think it's "4-06" upside down?  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_3 on 2017-08-28. Score: 31 | Accepted answer
  
  This looks like a [PLATE 2X2 ANGLE](https://brickset.com/parts/design-3956), which is broken. There is a rough side shown on the picture.
  
  [![enter image description here](https://i.sstatic.net/8IyvB.jpg)](https://i.sstatic.net/8IyvB.jpg)
  
  > **Comments:**
  > **username_4**: Looks like it was intentionally smoothed a bit after cutting or breaking, possibly for some one-off custom purpose.  
  > **username_5**: @username_4: I have lots of parts that are 30-40 years old that have a broken edge that is now rounded because it was in use for so long  
  > **username_1**: Huh, I thought it was familiar. Good job!  
  > **username_0**: Sorry for the delay--there is indeed a Lego part number on the bottom, which is 3956. On closer inspection, I think the above comments are right--the broken edge is not completely flat, but rounded! No wonder I couldn't find this in Bricklink.  Thanks to all!  
  
  ---
  
  