transparency question

Hi people,
Can anyone tell me if there is a name for the type of transparency I am using in a game I am working on?

When drawing the textures I am using GlBlend at the start which makes all parts of the image that are black transparent. Is there a specific name for this and is it a good way to make tex’s transparent.

Thanx in advance for any replies :o)

It may be anything. Please be more specific and post your glBlendFunc equation.