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  2. Snellen chart - Wikipedia

    en.wikipedia.org/wiki/Snellen_chart

    Three lines above, the letters have twice the height of those letters on the 6/6 (or 20/20 in the US) line. If this is the smallest line a person can read, the person's acuity is "6/12" ("20/40"), meaning that this person needs to approach to a distance of 6 metres (20 ft) to read letters that a person with normal acuity could read at 12 metres ...

  3. Lexicographic order - Wikipedia

    en.wikipedia.org/wiki/Lexicographic_order

    The lexicographical order is one way of formalizing word order given the order of the underlying symbols. The formal notion starts with a finite set A, often called the alphabet, which is totally ordered. That is, for any two symbols a and b in A that are not the same symbol, either a < b or b < a .

  4. For sale: baby shoes, never worn - Wikipedia

    en.wikipedia.org/wiki/For_sale:_baby_shoes...

    v. t. e. "For sale: baby shoes, never worn." is a six-word story, popularly attributed to Ernest Hemingway, although the link to him is unlikely. [1] [2] Versions of the story date back to the early 1900s, and it was being reproduced and expanded upon within a few years of its initial publication. [1] [3] The first known connection to Hemingway ...

  5. Seven-segment display character representations - Wikipedia

    en.wikipedia.org/wiki/Seven-segment_display...

    Although there is no official standard, today most devices displaying hex digits use the unique forms shown to the right: uppercase A, lowercase b, uppercase C, lowercase d, uppercase E and F. To avoid ambiguity between the digit 6 and the letter b the digit 6 is displayed with segment A lit.

  6. Rhombicosidodecahedron - Wikipedia

    en.wikipedia.org/wiki/Rhombicosidodecahedron

    Net. In geometry, the rhombicosidodecahedron is an Archimedean solid, one of thirteen convex isogonal nonprismatic solids constructed of two or more types of regular polygon faces . It has 20 regular triangular faces, 30 square faces, 12 regular pentagonal faces, 60 vertices, and 120 edges .

  7. Syntactic hierarchy - Wikipedia

    en.wikipedia.org/wiki/Syntactic_Hierarchy

    Syntactic hierarchy. Syntax is concerned with the way sentences are constructed from smaller parts, such as words and phrases. Two steps can be distinguished in the study of syntax. The first step is to identify different types of units in the stream of speech and writing. In natural languages, such units include sentences, phrases, and words.

  8. Memory address - Wikipedia

    en.wikipedia.org/wiki/Memory_address

    Memory address. In a computer using virtual memory, accessing the location corresponding to a memory address may involve many levels. In computing, a memory address is a reference to a specific memory location used at various levels by software and hardware. [1] Memory addresses are fixed-length sequences of digits conventionally displayed and ...

  9. List of mnemonics - Wikipedia

    en.wikipedia.org/wiki/List_of_mnemonics

    Where ever there is a Q there is a U too (But this is violated by some words; see:List of English words containing Q not followed by U) Letters of specific syllables in a word. BELIEVE; Do not believe a lie. SECRETARY; A secretary must keep a secret. TEACHER; There is an ache in every teacher. MEASUREMENT