The phrase "am a sign of" implies that something indicates or represents another thing. There are various synonyms that could be used to convey the same meaning, including "symbolize," "represent," "portray," "demonstrate," "exhibit," "betoken," "embody," "denote," "manifest," and "reflect." Each of these words can be used in different contexts and with different connotations. For example, "symbolize" may suggest a deeper or more abstract meaning, while "exhibit" may suggest a more overt or explicit display of something. Overall, these synonyms give us various options for expressing the concept of showing or indicating something else.