Up to 1' sq.
The caster is able to inscribe, visibly or invisibly, their personal rune or mark, as well as up to two additional characters per infused Weave.
A Wizard Mark spell enables the caster to etch the rune upon stone, metal, or any softer substance without harm to the material upon which the mark is placed. If an invisible mark is made, a Detect Magic spell will cause it to glow and be visible (though not necessarily understandable).
Detect Invisibility, True Seeing, or some magic items can expose an invisible Wizard Mark. A Read Magic spell will reveal the maker's words, if any. The mark cannot be dispelled, but it can be removed by the caster or by an Erase spell.