Ellipsis is not a mathematical term. An ellipsis comprises a set of three dots (...) which is used to indicate text that is omitted but whose content should be clear from the context. An example of its use in mathematics is 1 + 2 + 3 + ... + 25 to indicate the sum of all the integers from 1 to 25.
leave words out of a quote. An ellipsis is used for the omission from speech or writing of a word or words that are superfluous or able to be understood from contextual clues.
A network of lines used for locating points is a coordinate grid
Points can be used to buy prints and merchandise in the deviantart store. To commission people and also to buy premium membership
A compass