System of indication or of the selector type or one advances intermittently, in which all values are presented as numbers:

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The main idea is a numeric, discrete readout that progresses in steps. A digital type is exactly that: values are shown as numbers and advance in distinct increments when you move through them, rather than changing in a smooth, continuous way. This makes sense for a selector or indicator that steps through a sequence and always displays values numerically. The other options don’t fit as well because they describe devices or concepts that aren’t inherently about a numeric, stepped readout: an electronic indicator could refer to various display styles, a printer outputs copies rather than live numeric values, and type registering isn’t a standard term for a numeric-selector readout. So the description aligns best with digital type.