PM

Usage notes

 * Used in combination with a subscripted number representing the size of the particles in micrometres. Thus, PM2.5 represents particles with a maximum diameter of 2.5µm.

Verb

 * 1) To project manage.
 * 2)  To send a private message to (a participant in a chat room, etc.).

Etymology 1
, from.

Etymology 2
.

Noun

 * 1) market price

Etymology
.

Noun

 * 1) memo