Thorn with stroke

Ꝥ (minuscule: ꝥ), or Þ (thorn) with stroke was a scribal abbreviation common in the Middle Ages.

It was used for Old English: þæt (Modern English "that"), as well as Old Norse: þor-, the -þan/-ðan in síðan,[1] þat, þæt, and þess.

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 ( ).

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

[2] The codepoints are U+A766 Ꝧ LATIN CAPITAL LETTER THORN WITH STROKE THROUGH DESCENDER, and U+A767 ꝧ LATIN SMALL LETTER THORN WITH STROKE THROUGH DESCENDER.