Here’s what I found.

Count

143,859.¹

Full table: https://unicode-table.com/en/#basic-latin

Methodology

This short article assumes that by now, every useful/usable/commonly-used character has been encoded and added to the unicode standard.

This is not necessarily the case. In fact, “Unicode standard doesn’t freeze, it continues to evolve.”²

Definitions

Character (computing): In computer and machine-based telecommunications terminology, a character is a unit of information that roughly corresponds to a grapheme, grapheme-like unit, or symbol, such as in an alphabet or syllabary in the written form of a natural language.³

Unicode is an information technology standard for the consistent encoding, representation, and handling of text expressed in most of the world’s writing systems.

[1] https://www.wikiwand.com/en/Character_(computing)

[2] https://unicode-table.com/en/#supplementary-private-use-area-b

[3] https://www.wikiwand.com/en/Unicode

Here’s what I found.

Count

97.

Entire lit: https://github.com/aa-ag/counting_stuff/blob/main/http_status.txt

Definitions

HTTP: The Hypertext Transfer Protocol is an application layer protocol for distributed, collaborative, hypermedia information systems.¹

(HTTP) Status Codes: are issued by a server in response to a client’s request made to the server. It includes codes from IETF Request for Comments (RFCs), other specifications, and some additional codes used in some common applications of the HTTP. The first digit of the status code specifies one of five standard classes of responses. The message phrases shown are typical, but any human-readable alternative may be provided. Unless otherwise stated, the status code is part of the HTTP/1.1 standard (RFC 7231).²

Methodology

A little Python and a lot of curiosity go a long way:

[1] https://en.wikipedia.org/wiki/Hypertext_Transfer_Protocol

[2] https://en.wikipedia.org/wiki/List_of_HTTP_status_codes

Here’s what I found.

Count

1635.

Entire list: https://github.com/aa-ag/counting_stuff/blob/main/formats.txt from https://en.wikipedia.org/wiki/List_of_file_formats

Definitions

A file format: A format for encoding information in a file. Each different type of file has a different file format. The file format specifies first whether the file is a binary or ASCII file, and second, how the information is organized.¹

Methodology

A little Python and a lot of curiosity can go a long way:

[1] https://www.webopedia.com/definitions/file-format/

Here’s what I found.

Count

539.¹

Definitions

CSS: Cascading Style Sheets (CSS) is a simple mechanism for adding style (e.g., fonts, colors, spacing) to Web documents.¹

CSS) property:

Here’s what I found.

Count

Short answer: 252 (April, 2021). 32 of which are “obsolete and deprecated.” So, 220.

Long answer: trick question, because HTML5 supports custom elements.

Longer answer: entire list here.

Definitions

HTML: Hypertext Markup Language provides the structure of the page.²

(HTML) Elements: The elements of the language label pieces of content such as “paragraph,” “list,” “table,” and so on.³

Methodology

A little Python and a lot of curiosity can go a long way:

[1] https://www.w3.org/standards/webdesign/htmlcss

[2] Idem.