"in upper case" is correct and usable in written English.
You can use it when referring to text that is in all uppercase letters. For example, "Type your name in upper case."
R.F.C., in upper case, is a Rugby Football Club for a sports enthusiast.
They added: "The product had the word 'Coramine' in upper case letters on the front.
Many companies, including Apple, now require a password with eight or more characters, with at least one numeral and one letter in upper case.
In the 1970s King began to develop a recognisable, but varied graphic style consisting of heavy rules – bands of black, five-pointed stars, and heavy sans-serif type, most often in upper case only.
In his sermons from the autumn of 1989, before the Berlin Wall was toppled and Communist rule in East Germany brought to an end, the words "vision," "imagination," and "dream" appear frequently — heavily underlined or printed all in upper case.
Applicants who type only in lower-case letters, or entirely in upper case, are less likely to repay loans, other factors being equal, says Douglas Merrill, founder of ZestFinance, an American online lender whose default rate is roughly 40% lower than that of a typical payday lender.
Hereafter, raw values of measured quantities and observational parameters will be written in upper-case letters as P and Y, respectively.
In this article, boldface symbols are used in lower-case letters for vectors (e.g., a), and in upper-case letters for matrices (e.g., A).
In the description of the schema below, schema tables and field names (but not necessarily the variable/identifier names with which they are populated) are shown in upper-case.
In this paper, the acronym of this measure is used in upper-case letters (T F- I D F) in order to avoid confusion with term frequency - inverse document frequency [33], in which acronym of the latter is used in lower-case letters (t f- i d f).
Lopes and co-workers[9, 34] extracted bigrams and trigrams based on the same linguistic methods used by Lopes and Vieira [10] and ordered them using the numerical values obtained by the application of the following statistical measures: t f, t f- i d f, t d s, t h d, T F- I D F (refered in this work in upper-case letters to differentiate it from the t f- i d f measure).
