Personally I have used this as an icon for 1.5 years. Assuming you need both a logomark and the icons to launch the app, it can be adapted as follow.
The concept is using indented bullet points that resembles a “L” in reference to “log” phase of PKM and a magnifying glass that resembles a Q in reference to the “seek” phase, because everything in Logseq can be summarized as “log information and seek for it later”:
Log&seek → Logseq.
