What is the meaning of Ema?

A wooden plaque bearing a prayer or wish, left hanging at a Shinto shrine.

The name of the Latin-script letter M/m.

tending to

mother

a reproductive female animal in a hive; a queen

Rōmaji transcription of えま

to stand

first-person plural present/imperative active of eti (to come)

rhea bird

to stand

to kill

to lose

to throw

he, she

good; having intrinsic value (e.g. decent (of a person) or healthy (of food))

person

people

to stand

Source: wiktionary.org