You need a key so people can see what the picture your picture graph uses means.
The Key?
In everyday use, 10. But only 2 in binary arithmetic, 8 in octal and 16 in hexadecimal. The latter three are all key to computers and electronic calculations.
The roman numeral system progresses similarly to making tics and crossing them out. In roman numerals 1 = I 5 = V 10 = X 100 = C In order to represent numbers in between these key symbols, we either place symbols before the main character to represent an number lower, or after for a number higher. E.g. 1 = I 2 = II 3 = III 4 = IV 5 = V 6 = VI 7 = VII 8 = VIII 9 = IX 10 = X 11 = XI ...
The "key" tells you what the line(s) of plotted data on a graph represent (e.g people, money, time etc...) without this information the graph is meaningless because it is incomprehensible.
Symbols are small, well, symbols that are ON the map. The Key is off to the side, and tells you what the symbols mean.
the key or legend
represent the key...
A key.
The first meaning of the ivory key within Freemasonry is "secrecy". As with all Masonic symbols, there are several further elaborative meanings reserved only for members of the Fraternity, but which are based upon this first meaning. Typically the ivory key will always be seen hanging from a string or strap. This can be publicly viewed on images of tracing boards or Masonic aprons.
a amp key should tell what the symbols on a map mean. What does a blackened dot usually represent
symbol
Within the 'for rent' building you will find a key chart which explains what the symbols on the wheel represent.
Symbols that represent dedication include a candle, a heart, a key, and a tree. These symbols are often used to convey the concepts of commitment, passion, loyalty, and growth, all of which are closely associated with dedication.
A picture graph uses pictures or symbols to show data. One picture often stands for more than one vote so a key is necessary to understand the symbols.
She is the goddess of the hearth so her symbols are the kettle and the key because those represent home and cooking.
The key of the map explains all the symbols used on the map.