thanks mexicanyella post#2 - I didn't know that. Bass to treble, D G D G B D is the "other Open G" until rn!
back to OP's question - after this self-answered Q.? Have I had my coffee? Yes.
GOOD QUESTION!!!
Tunings is called everrrr darn thing! e.g., Sebastopol idk - Open A idk - Open D idk
In Dobro "Open G" MIGHT be, bass to treble, GBDGBD
But I'm pretty sure that's NOT Keith Richards' (an electric guitarist with the Rolling Stones, a rock group) idea of "Open G"
Pretty sure open E would be, low to high, a/k/a bass to treble, E B E G# B E like probably the notes of the first E chord I ever fretted in low to high bass to treble EADGBE tuning
a/k/a DO SO DO MI SO DO giving me intervals, 6th string with 5th string, 5th string with 4th string, etc., of
DO to SO a fifth ...
SO to DO a fourth ...
DO to MI a MAJOR 3rd ...
MI to SO a minor third ...
SO to DO a fourth
(advancing slide players may thank me 4 that ^ when they're doing their double-stop fills and harmonizing their melody)
HOWEVER!

I don't think Open A or Open D mean those same intervals. Idk WHAT they mean. SELF-INDULGENT IN-CROWD B.S. I like my bass to treble C6, CEGACE, but:
"DADGAD" is the ONLY well-named tuning! ime. Ok "standard" means EADGBE. But words and symbols are SUPPOSED to DIFFERENTIATE amirite?
Come to think about it "bass to treble" KICKS "low to high" ASS because the treble strings are lower (to the ground)
I read where Jerry Byrd occasionally used a very close-interval tuning on an 8-string that was practically the DO RE MI major scale (with one exception I forget what)
I thought keyboard players would LUV that, if they wanted to slide some
Earl Hooker played slide in EADGBE, bass to treble, tuning

. Check out instrumental "Tanya" by Earl Hooker. Its 4-bar intro is typical, but then! the feeling is crazy good ime. The visuals are stills; warning - the last one saddens.
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