What is the meaning of %?

The percent; portion of a total of 100.

Used as a wildcard, usually in SQL, to stand for zero or more characters.

Used as the symbol for the modulus, placed between two numbers, to get the remainder of the division of those numbers.

the asteroid (5) Astraea.

Used in the percent-encoding of uniform resource identifiers such as URLs.

Suffix forming speedrunning categories requiring a given percentage to qualify.

Suffix forming speedrunning categories related to the suffixed element, or subject to constraints based on it.

percent

Alternative form of (to have sex)

Source: wiktionary.org