ASCII 245
Lowercase o with tildeIntegral bottom half
ASCII 245 is õ on Windows and ⌡ in old DOS.
õ (Small O with Tilde) is byte 245 in Windows-1252, Unicode U+00F5. Portuguese uses it in plurals like limões and nações, and Estonian treats õ as a vowel of its own, as in õde (sister). It also stands in for a letter it isn't. Hungarian needs ő, with two slanted strokes, which Latin-1 fonts and code pages never had, so some older Hungarian web pages printed õ instead: szõlõ for szőlő (grape). When you import such text, map õ to ő, and û to ű, for Hungarian sources only. In UTF-8, õ is C3 B5, which misreads as õ. The HTML entity is õ.
⌡ (Bottom Half Integral) is byte 245 in code page 437, the original IBM PC character set, and maps to Unicode U+2321. It's the lower half of a two-row integral sign and belongs directly under ⌠ (244). Code page 850 replaced both halves with typographic marks, so a DOS formula written in 437 and read as 850 shows a pilcrow ¶ stacked over a section sign § where the integral was. There's no named HTML entity, so use ⌡. In UTF-8 it's E2 8C A1.
Technical Details
Technical Details
Code Example
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#include <stdio.h>int main(void) {/* On Windows (code page 1252) byte 245 is õ.Modern terminals expect UTF-8, so print the code point, not the byte. */printf("\u00F5\n"); /* UTF-8: C3 B5 */unsigned char b = 245; /* the raw Windows-1252 byte */printf("%d 0x%02X\n", b, b); /* 245 0xF5 */return 0;}
Code Example
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#include <stdio.h>int main(void) {/* Byte 245 is ⌡ only on a console using code page 437(chcp 437 on Windows, or DOSBox). On a UTF-8 terminal thelone byte 0xF5 is invalid and prints as garbage, often �. */putchar(245);/* char is signed on x86, so a plain char holding 0xF5 is -11.Use unsigned char when you compare or index by byte value. */char c = (char)245;unsigned char u = 245;printf("\n%d %d\n", c, u); /* -11 245 *//* Portable: print the Unicode character as UTF-8 instead. */printf("\u2321\n"); /* E2 8C A1 */return 0;}
How to Type It
- Windows
- Hold Alt and type 0245 on the numeric keypad, with Num Lock on. The leading zero picks the Windows code page. No numeric keypad? In Word, type 00F5 and press Alt+X.
- Mac
- Press Option+N, then o.
- Linux
- In GNOME, or any desktop running IBus, press Ctrl+Shift+U, type f5, then Space. With a Compose key set up, press Compose, tilde, o.
- Phone
- Long-press o and pick õ.
How to Type It
- Windows
- Hold Alt and type 245 on the numeric keypad, with no leading zero. US PCs insert ⌡, but PCs set to code page 850, common in Western Europe, insert §. No numeric keypad? In Word, type 2321 and press Alt+X.
- Mac
- Press Control+Command+Space to open the Character Viewer, then search for "bottom half integral".
- Linux
- In GNOME, or any desktop running IBus, press Ctrl+Shift+U, type 2321, then Space.
- Phone
- Phone keyboards have no key for it. Tap the character at the top of this page to copy it.
Frequently Asked Questions
Portuguese words ending in -ão have three possible plurals, and the singular doesn't tell you which one applies: limão becomes limões, mão becomes mãos and pão becomes pães. Each word's plural has to be learned, and a few, like vulcão, accept more than one form (vulcões or vulcãos).
Estonian treats õ as its own letter and files it after w, followed by ä, ö and ü, so õde comes after vesi. Code point order gets this wrong, since it puts ä before õ. Estonian also files z and ž right after s, so use `new Intl.Collator('et').compare` rather than a plain sort.
Add the zero: Alt+0245 gives õ, and Alt+0213 gives Õ. The short form reads the number from the DOS table instead, and on a US system 245 there is the bottom half of an integral sign.
Frequently Asked Questions
Add the zero: Alt+0245 gives õ, and Alt+0213 gives Õ. The short form reads the number from the DOS table instead, and on a US system 245 there is the bottom half of an integral sign.