It may make it easier to see these if you increase the size of the font on your web browser.
Symbol
decimal
hex
value
ˈ
712
02C8
(primary) stress mark
ˌ
716
02CC
secondary stress
ː
720
02D0
length mark NB: Some versions of Internet Explorer have a problem that cause this character not to display correctly or at all. A colon can be used instead.
ˑ
721
02D1
half-length
ʼ
700
02BC
ejective
ʴ
692
02B4
rhotacized
ʰ
688
02B0
aspirated
ʱ
689
02B1
breathy-voice-aspirated
ʲ
690
02B2
palatalized
ʷ
695
02B7
labialized
ˠ
736
02E0
velarized
ˤ
740
02E4
pharyngealized
˞
734
02DE
rhotacized
Note the ready-made characters ɚ 602 025A (combining ə 601 0259 and ˞ 734 02DE) and ɝ 605 025D (combining ɜ 604 025C and ˞ 734 02DE).
Some of these are hard to use/see, especially in smaller sizes. They are displayed here with an appropriate supporting base character. When composing a text in HTML, enter the diacritic after the base character, thus (voiceless n, n̥) n̥. The web browser automatically backspaces the diacritic, but by a constant amount, which may or may not generate a acceptable result.
Symbol
decimal
hex
value
n̥ d̥
805
0325
voiceless
ŋ̊
778
030A
voiceless (use if character has descender)
b̤ a̤
804
0324
breathy voiced
t̪ d̪
810
032A
dental
s̬ t̬
812
032C
voiced
b̰ a̰
816
0330
creaky voiced
t̺ d̺
826
033A
apical
t̼ d̼
828
033C
linguolabial
t̻ d̻
827
033B
laminal
t̚
794
031A
not audibly released
ɔ̹
825
0339
more rounded
ẽ
771
0303
nasalized
ɔ̜
796
031C
less rounded
u̟
799
031F
advanced
e̠
800
0320
retracted
ë
776
0308
centralized
l̴ n̴
820
0334
velarized or pharyngealized
ɫ
619
026B
(ready-made combination, dark l)
e̽
829
033D
mid-centralized
e̝ ɹ̝
797
031D
raised
m̩ n̩ l̩
809
0329
syllabic
e̞ β̞
798
031E
lowered
e̯
815
032F
non-syllabic
e̘
792
0318
advanced tongue root
e̙
793
0319
retracted tongue root
ĕ
774
0306
extra-short
e̋
779
030B
extra high tone
é
769
0301
high tone
ē
772
0304
mid tone
è
768
0300
low tone
ȅ
783
030F
extra low tone
x͜x
860
035C
tie bar below
x͡x
865
0361
tie bar above
Arrows
Symbol
decimal
hex
value
↓
8595
2193
downstep
↑
8593
2191
upstep
→
8594
2192
(becomes, is realized as — not recognized by the IPA)