What is this type of headphone icon in notification bar?

Question

My phone (LG G3) shows two different types of headphone icons. They are the leftmost icons in the images below. The first is a normal headphone icon. What is the second one?

I think it might be USB headphone, but that doesn't make sense, because I don't have USB headphones and never use USB headphones with the device.

I have noticed sometimes when I use the aux cable for my car, it displays the second icon instead of the first one. It shows the first icon whether I use headphones with a built-in mic or headphones that don't have a mic - it's the same icon.

Image 1: normal headphone icon

Image 2: ??

Any thoughts?

Edited images to make them smaller

— TangoFoxtrot | Sources

Answer

Second one is showing a line out or auxiliary audio
icon, which means that it had recognised that a jack had been plugged in ( but it doesn't detect a speaker or maybe it detects the speaker ) but fundamentally to differentiate between regular headset (with or without mic) and speaker connected with line out

If this happens when you connect to regular headphone, it indicates some dirt or pocket flint , preventing recognition of head phone. Cleaning with a tooth pick , ear bud and blowing air to dislodge muck should fix. If it doesn't, try app mentioned here
What is this icon in my status bar?

Later versions of LG also differentiate between headphone with speaker and without speaker

I had this icon show up on a Dopod phone, owned a decade ago

— beeshyams | Sources

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