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Dropship Alternative Design#
The Dropship model has an unused white variant named "dropship_02.vmat", which mirrors the design pattern seen with the Combine Grunts and Construction Striders.
dropship_02.vmat |
When applied |
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User Interface#
An icon for a checkmark simply called "icon_check.vtex", and a circle named " autoaim.vtex" that appears to represent a scope locking onto a target. 
"indicator_person"#
Part of the "vr_teleport_destination_ladder" model, which also goes unused. 
Commentary Mode#
Early Hud Icons#
icon_commentary.vtex, icon_commentary_off.vtex, and icon_commentary_small.vtex are hud icons found in 'dev/vgui/materials/hud/'.
The first one appears to be directly taken from previous Source engine games, while the other two are simply edited versions likely used for testing purposes.
It was likely intended to be used in the interface and sit right next to the audio player, akin to previous Valve titles. However, in the final game, a headset icon is used instead, likely to better match the updated appearance of the commentary nodes.
point_commentary_node.vmat#
A simple icon of a commentary node. It's compiled as a .vmat material, it likely wasn't intended for the interface. When spawned in Hammer, it has the property of always facing the player's camera, suggesting it was meant to serve as a waypoint, similar to a quest marker.
Generic Textures#
A circular check button, "icon_complete.vtex". 
Orange Box#
The reticle from the console version of Half-Life 2. 
Left 4 Dead and Portal Textures#
User interface elements ported from Left 4 Dead 2 and Portal 2 found in dev/vgui/materials/hud. 
As well as the locked achievement icon from the original Portal. 