14 CFR §95.3
For the purposes of this part—
- (a)COP means changeover point.
- (b)L means compass locator;
- (c)LF/MF means low frequency, medium frequency;
- (d)LFR means low frequency radio range;
- (e)VOR-E means VOR and distance measuring equipment; and
- (f)Z means a very high frequency location marker.