This article is from the Digital Pianos Specifications FAQ, by Isako Hoshino firstname.lastname@example.org.
model number: "*" after the model number indicates "digital
ensemble" (which means, it has *LOTS* of other
miscellaneous sounds allowing you to play an
ensemble - orchestra)
"+" after the model number indicates keyboard-only
configuration (optional stand)
key: number of keys, type of key action
key cover: key cover
polyphony: how many notes can be simultaneously played (max.
means that not all voice settings will produce the
maximum polyphony), type of digital sampling
Touch sense: alternate touch sensitivity settings
Sounds: how many different voices (what kind)
Pedals: how many pedals (what kind), sF = sforzando-piano
Dig. Effects: sound enhancement effects
Dig. Reverb: digital room acoustic effects
Brilliance: alternate over all piano sound brightness setting
Transpose: range of transposition
Mode set: availability of - Piano tuning (lower pitches are
tuned slight lower, higher pitches slightly higher);
minimum range (no sound produced when key is played
extremely softly); sostenuto (make the soft pedal
work as sostenuto pedal); (miscellaneous piano sound
Others: phone jacks, etc.
Misc: other additional features - adjustments, displays,
Output: amplifier power and how many
Speakers: speaker size and how many
Dimensions: W x H (with music stand up) x D
Net weight: weight
Year: dates in production (c means circa), and name of
replacement model if any.