Sequence signals are used against both suit and no-trump contracts. They can also be used when following suit or discarding.
West leads the
When West leads the
This signal does not necessarily have its own name, and I have called it a "sequence signal" in an attempt at semantic clarity. In his book "How to Defend a Bridge Hand", Bill Root refers to this as "Signaling with honor cards." In one of his bridge defense articles, Mike Lawrence calls it an "information signal."