:I think it is a double headed arrow with a starburst in the middle and two points at each end.
2.
Then, click on the Character Spacing icon ( ie . the icon which displays AV with a double headed arrow at the bottom ).
3.
The double headed arrow was introduced by the German chemist Fritz Arndt who preferred the German phrase " zwischenstufe " or " intermediate stage ".
4.
We find, as we'd expect, that the resultant ( double headed arrow ) force acts down the slope, which will cause the particle to accelerate in that direction.
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