If you're looking to add Sony's official PS4 symbol codes such as button and system symbols to a project, then a Japanese EagleCrew modder known as Bann3r (BannerR3 on YouTube) has just what you're seeking covering up to 4.72 OFW! 
Check them all out below via HydrogenNGU, and to use them simply copy and paste the font text symbols into your project and they should appear as pictured below.
From Pastebin: PS4 Symbol Codes, 4.72 FW
From Pastebin: PS4 Symbols
Also from david1337hax, to quote:
Here are some "emojis" for the PS4 notification tool:
Info:
I have just tested the square & dpadright one for my menu. The rest is still untested. Please let me know if they work. I have also just tested it on firmware 4.05 and 4.55.
How to use that stuff?
1. Copy & Paste the emoji (before the ==) into your payload.
2. Build your payload.
3. Done.
You don't need to put me into the credits. This is for everyone pretty much.
Hope you enjoy,
~ david1337hax
From Pastebin.com:
Cheers to @HydrogenNGU on for the initial heads-up, and @Bultra for some PS4 4_71 Symbols.rar (1.06 MB), @Lush78, @oneman123, @X41 and @xxmcvapourxx in the PSXHAX Shoutbox! 
Check them all out below via HydrogenNGU, and to use them simply copy and paste the font text symbols into your project and they should appear as pictured below.
Code:
// by bannerr3
// thx Hydrogen :p
PSPlus
Exclamation
LPAD
RPAD
PSmove
PS2
MOVIE
PICTURE
Lock
Whitefinger
Blackfinger
HD
battery0
battery1
battery2
battery3
micmute
speaker 1
speaker2
speaker3
speakermute
headphone
headphone2
speak
new
Balloon
good
person
ブロンズ
シルバー
ゴールド
プラチナ
PS3tag
PS4tag
PSvitatag
PScamera
battery?
speaker0
PSlogo
PSNball
PSstore
PS3logo
PS4logo
PSNlogo
PSPlogo
PSVITAlogo
NY
TrophyStar
WhitePSball
PSstore
rightarrow
cross
mic
Code:
//by EC bann3r - twitter.com/bannerr3
//sorry reupload
- Button Symbols
Circle
Cross
Square
Triangle
DPADUp
DPADDown
DPADLeft
DPADRight
L1
L2
L3
R1
R2
R3
Select
Option
PSButton
- System Symbols
PSPlus
Exclamation
LPAD
RPAD
PSmove
PS2
MOVIE
PICTURE
LOCK
whitefinger
blackfinger
HD
battery0
battery1
battery2
battery3
micmute
speaker 1
speaker2
speaker3
speakermute
headphone
headphone2
speak
new
Balloon
good
person
ブロンズ
シルバー
ゴールド
プラチナ
PS3tag
PS4tag
PSvitatag
PScamera
battery?
speaker0
PSlogo
PSNball
PSstore
PS3logo
PS4logo
PSNlogo
PSPlogo
PSVITAlogo
NY
TrophyStar
WhitePSball
PSstore
rightarrow
cross
mic
Here are some "emojis" for the PS4 notification tool:
Code:
== Button_Circle
== Button_Square
== Button_Triangle
== Button_X
== Button_Dpad_Up
== Button_Dpad_Down
== Button_Dpad_Left
== Button_Dpad_Right
== Button_L1
== Button_L2
== Button_R1
== Button_R2
I have just tested the square & dpadright one for my menu. The rest is still untested. Please let me know if they work. I have also just tested it on firmware 4.05 and 4.55.
How to use that stuff?
1. Copy & Paste the emoji (before the ==) into your payload.
2. Build your payload.
3. Done.
You don't need to put me into the credits. This is for everyone pretty much.
Hope you enjoy,
~ david1337hax
Code:
More PS4 Emojis/Icons
== Button_Share
== Button_Options
== Button_Home/PSN
== PS4_Gold_Star