It is relating to or using signals or information represented by a continuously variable physical quantity such as spatial position, voltage, etc. (Clue: 1 word you may write in all CAPS or lower case letters)

From the Latin word “digitus”  or “digitalis” which means finger, or toes.

Group the following devices according to their signal produced.

Match the picture that represents the signals.

Match the number system to their base number.