if you know you can create a shortcut of any lines for easy type using Text Replacement word. So here you have to do same things but for apple symbol or logo. There is no any limitations for add shortcut if you added already. So take advantage of custom keyboard of your iOS device as type Apple symbol from iPhone or iPad that’s not possible on any other mobile OS.
Otherwise, you have another option as keep copy of apple icon in note app. But below steps is very quick for frequently use in your Mail app, Note app and any other supportive messaging apps.
After add this, if you fluctuate with your text and want to remove apple icon from keyboard then you can do it through reverse process of below steps. 
Note: Here you have to open this web page in your iPhone or iPad’s browser, because you can copy apple logo as a symbol from device.
How to type Apple symbol from iPhone, iPad: iOS 9, iOS 8 or iOS 7
Step 1: Copy: (Apple Logo or Symbol). For copy tap on it and hold until you will see selection area.
Step 2: After select Apple logo only, Copy it from option.
Step 3: Next, Go to Settings app on iPhone or iPad.
Step 4: Now, General > Keyboard.
Step 5: Next, Under the keyboard option tap on Text Replacement.
Step 6: From Top right corner, Tap on ‘+‘ icon.
Step 7: inside the phrase option, tap there. and choose paste. 
Step 8: Next, type any word that will be use as a shortcut. here I added appl.
Note: Mostly people asking about use apple symbol or logo to Facebook, Twitter, Google+, Chat apps, Mail App, Instagram, Pinterest and many other social networking app. answer is yes, you can do. 
Only type shortcut that you have set in your device specific under Text Replacement. same you can do for Mac.
want more help on add logo or type Apple symbol from iPhone, iPad or iPod Touch. So share with on Facebook, Google+, or below comment.