The story
A typescript approximation of a percent sign % with the top zero replaced with 'a' for atom.
Etymology from Wiktionary, CC BY-SA 4.0.
Today it means: atomic percent (percent calculated by number of atoms) Full definition →
A typescript approximation of a percent sign % with the top zero replaced with 'a' for atom.
Etymology from Wiktionary, CC BY-SA 4.0.