SMP

Etymology
Initialisms.

Proper noun

 * 1)   one of the sets of character codepoints in Unicode; formally known as Plane 1, and comprising the range of codepoints from U+10000 through U+1FFFF.
 * 1)   one of the sets of character codepoints in Unicode; formally known as Plane 1, and comprising the range of codepoints from U+10000 through U+1FFFF.

Etymology
Initialism.

Noun

 * 1)  corresponding to junior high school (US) or lower secondary school (UK)