What does these two icons signify ? <> & *≡ ?*

satheesh:
what does these two icons signify ? <> & ≡ ?
image.png

Tanumoy Ghosh:
Guessing if --- denotes main-topic and &lt;&gt; denotes sub-topic

Mumshad Mannambeth:
The first one is text content. The second one is lab content.