The word "蟋蟀" is formed from two characters, each constructed as a phonetic compound: "蟋" combines the radical "虫" (indicating insect) with the phonetic component "悉" (suggesting the sound "xī"), and "蟀" similarly uses the radical "虫" with the phonetic component "率" (suggesting the sound "shuài"), together representing the cricket insect through their shared semantic radical and individual phonetic clues.