Q:

What is the 'd' in the literal 12d called?

I feel like I should know the answer to this, but I don't.  
What is the type character on a numeric literal called?  
double myDouble = 12d;
float myFloat = 10f;

I wanted to find a complete list of them today, but couldn't come up with what to ask Google to search for.  
EDIT
Found a decent list if anyone is interested
http://www.undermyhat.org/blog/2009/08/secrets-and-lies-of-type-suffixes-in-c-and-vb-net/

A:

It's called a data type suffix.

A:

Numeric Literal Suffix
A list:

uint:    u
long:    l
ulong:   ul
float:   f
decimal: m

A:

I don't know if there is an official term but the C# language spec commonly refers to them as type suffixes.

