UNIT

Following are some proposed examples of accepted values for the UNIT attribute:

Distance:

distance.m
distance.km
distance.dm
distance.cm
distance.mm
distance.um
distance.nm
distance.pm
distance.inches
distance.feet
distance.miles
distance.pixels

Angle:

angle.degree
angle.radian

Gain:

gain.linear (a normalized [0. 1.] range mapping to (-inf 0dB] )
gain.midigain (a MIDI-adapted gain, percentage-like - recommended mapping (midigain/dB pairs): {0, inf}, {100, 0dB}, {127, +12dB} )
gain.db (clipped to a minimum headroom value)
gain.db-raw (not clipped)

Time (and pitch):

time.second
time.bark
time.bpm
time.cents
time.hz
time.mel
time.midinote (usual MIDI note convention, in the range [0-127], with 36 being 440Hz)
time.ms
time.speed
time.samples

Speed:

speed.m/s
speed.mph
speed.km/h
speed.kn
speed.ft/s
speed.ft/h