button terminology, Mom?

[Admin]

Im buying some buttons and for the life of me (a long google search) I cant figure out what Mom stands for . . .

and what about:
Off-Mom
On-Mom
On-Off
On-On

I do however understand SPST, DPDT, N/C, N/O, latching, etc . . .

[JonHylands]

Mom - momentary

- Jon