e means event.
I have a post somewhere that explains what it all means, if I find it I will quote or link it.
----EDIT----
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I cant find that post.
the layout for thyme commands thats affect variables:
e.<address>.<variable>
----adressing----
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This is a list of the "adresses" and what they do:
Other - used on geometry colisions (oncollide) - this is used to adress the OTHER object in a collision (not the one with the code on)
THIS - used on geometry collisions (oncollide) - this is used to adress THIS object (the object with the code on)
Geom - used in laser hits (onlaserhit) - this is used to adress the geometry in a laser collision
laser - used in laser hits (onlaserhit) - this is used to adress the laser in a laser collision
----object variables----
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The next part is to "address" to a variable.
To see these variable just create an object and look at the script menu
Or check
THIS POST of [Thyme][1.5.61]Thyme Command/Variables List----examples----
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E.other.density = 5
this Means,
Set the density of the OTHER object (one without the code) to 5
If you need any more help with this, just ask, I or others may be willing to answer
Or even check
[Tutorial]Thyme Tutorial - With explanations at every step