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I tried to find an old topic about this, but I didn´t know what to search for really.
Anyway, in Black Mesa East and in Ravenholm(probably in other locations too, but I´ve only spotted these two), there is a spray logo very similar to the lambda logo. It´s orange, about the same size as the lambda one, and has a strange symbol in a circle.
It´s not Black Mesa, so i thought it might be Black Mesa East.
Btw, this is my first post in this forum and English isn´t my "first" language, so i might write somewhat ****ed up occasionly.