Thorn with stroke
Ꝥ (minuscule: ꝥ), or Þ (thorn) with stroke was a scribal abbreviation common in the Middle Ages. It was used for  (Modern English "that"), as well as , the / in , , , and . In Old English texts, the stroke tended to be more slanted, while in Old Norse texts it was straight. In Middle English times, the ascender of the þ was reduced (making it similar to the Old English letter Wynn, ƿ), which caused the thorn with stroke abbreviation (  ) to be replaced with a thorn with a small t above the letter (  ).

Unicode encodes Ꝥ as , and ꝥ at .

A thorn with a stroke on the descender also exists, used historically as an abbreviation for the word "through". The codepoints are , and .

References

 
 
 Andrew West, What's that? , an article about the proposal to add medievalist characters to the UCS
 Unicode Character 'Latin capital letter thorn with stroke' (U+A764)
 Unicode Character 'Latin small letter thorn with stroke' (U+A765)

Latin-script letters