Symbol Meaning: Capital "V" with Crossbar

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Discussion Overview

The discussion revolves around the meaning of a capital "V" with a horizontal crossbar, as encountered in a NASA paper from 1984. Participants explore its potential meanings and seek clarification on its usage within the context of the paper.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant describes encountering a symbol resembling a capital 'V' with a crossbar and seeks its meaning.
  • Another participant suggests it might be an inverted upper case A, which is a logic symbol meaning "for all."
  • Several participants request an image of the symbol or a link to the paper for better understanding.
  • One participant identifies the symbol as representing "Volume of ion production region (m3)" based on the nomenclature found at the end of the paper.
  • Another participant confirms the symbol appears in the paper and mentions its first occurrence in equation (12) on page 30, but expresses uncertainty about its meaning.
  • Further clarification is provided that the symbol indeed means "volume of ion production region," as confirmed by the glossary in the paper.

Areas of Agreement / Disagreement

Participants generally agree on the meaning of the symbol as "volume of ion production region," but there is some initial confusion and debate regarding its appearance and interpretation.

Contextual Notes

Some participants express uncertainty about the specific context of the symbol's use and its implications within the paper, indicating a need for further exploration of the concepts presented.

ckirmser
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I've run across a symbol on a NASA paper from 1984 that I am not familiar with and that I could not find in a web search.

It's a capital 'V' with a horizontal cross bar through its center. Any ideas?
 
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Was it an inverted upper case A? If so it might be the logic symbol meaning "for all".
 
Can you post an image of this symbol or provide a link to the paper?
 
Did it look like this?
$$\forall$$
 
Mark44 said:
Did it look like this?
$$\forall$$

What's it mean?
 
Mark44 said:
Did it look like this?
$$\forall$$

berkeman said:
What's it mean?
It means "for each" or "for all".
 
Well, with what I've been doing, I had become accustomed to the nomenclature of a paper being right up there by the introduction or abstract. So, I finally came to the end of this NASA paper and discovered - ta daaa!

The nomenclature.

So, the symbol, V with a horizontal cross-bar (duplicated by going into Word, or some such, typing a capital V and clicking the strike-through button), anyway, that symbol stands for, "Volume of ion production region (m3)."

Still trying to learn what that is - I am, by no means, really understanding more than the concepts of this paper - so, I don't know what that is, though I kind of have a guess.
 
  • #10
LCKurtz said:
Nice. You give us a 125 page document but no hint on what page to look for your symbol.

Just skimmed through it, there's a symbol matching his description first appearing at the bottom of page 30, in equation (12). Can't work out what it means though -- it appears again on page 38.

EDIT: Just checked the glossary at the bottom. It means "volume of ion production region", measured here in cubic metres.

EDIT 2: According to post #7, the OP has already discovered this...
 
Last edited:

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