Interpreting triangles in RC high pass filter circuit diagram
Those triangles mean &quot;common&quot; (often referred to as &quot;ground&quot;, but that is a discussion for a different question).
They are all connected, and yes, your second image is equivalent to the first.
These are very common on schematics because they help simplify and improve the readability.  Most circuits will have many points connect to common, so instead of lines all over the place they just drop a downward pointing triangle like that.  You are rarely concerned with what the common (or ground) is doing and are more focused on the rest of the circuit.
You can think of them like &quot;all currents return through the triangles&quot;.