Sequence signals can refer to different things depending on the context. Here are some possible definitions based on the search results:

• Linguistic forms that mark connections and relationships between parts of a piece of continuous writing: This definition is given in and in the context of technical English. Examples of sequence signals in this sense include "firstly," "secondly," "finally," "in conclusion," etc.

• Words that signal the sequence or order of events: This definition is given in in the context of storytelling or procedures. Examples of sequence words in this sense include "first," "next," "then," "finally," etc.

• A sequence of amino acid residues bound at the amino terminus of a nascent protein during protein translation: This definition is given in in the context of biology. This "flag" is recognized by the signal recognition particle (SRP) located freely in the cytoplasm or attached to the ribosome, and it signals the transport mechanism of the cell to prompt them as to where the emerging protein should go.

• Signals used in bridge defense to communicate with ones partner: This definition is given in. Sequence signals in this sense are used against both suit and no-trump contracts, and they can also be used when following suit or discarding. Examples of sequence signals in bridge include "high-low" to show an odd number of cards, "low-high" to show an even number of cards, etc.

In summary, sequence signals can refer to different things depending on the context, such as linguistic forms, words, amino acid residues, or signals used in bridge defense.