Real Tilde Symbol on Macbook13 is missing Can only find the superscript one

Question

I recently looked up where to find the true Tilde sign (that's the wavy line symbol) since the one I can see on upper case of the key next to the Z on the keyboard makes the wrong one. I tried it and it made a straight line with right-angled symbol. Wrong one for the Tilde.
OK so the next thing I tried was Alt +N key and that gave a superscript Tilde still not the right type. That one was designed to go over the top of a letter so it highlights with an orange bar to show it's superscript.
The reason I know it's wrong is because I tried using Alt+N in a password that I use to get onto a site where I do online purchases and it wouldn't accept it.
I have a password that contains about four symbols with letters and numbers and the symbols require a Tilde and a # sign. The password was rejected and the only way I could get it to log me in was if I copy pasted the password using a Tilde from Microsoft Word's Symbols list, ported to my Macbook from my PC in a simple .doc file and then it worked.
I'm gobsmacked' that the Mac system hides away or even doesn't have a proper Tilde sign.
I went into the System preferences and checked out my English Flagged Keyboard layout and showed the Keyboard layout menu on screen. I tried every combination of every Alt and Shift and Cmd key with that list and nowhere is there a proper Tilde. In the end I gave up and changed my password to one that doesn't contain this key which has been so frustrating not being able to use one on the mac.
Is it hiding somewhere? Where have they buried it and does anyone know why?

Answer 1

I didn't get the British Layout anywhere - it was on my Macbook 13 purchased new in the UK.
It is really impossible for a totally new Mac to have those layouts included, which are special add-ons which some people install for PC keyboards, or because they want a PC layout. Something is not right there. You should ask the place where you bought that machine how your OS could have had foreign stuff added to it like that and maybe express concern about whether it was really "new."
I've been to the Layouts and note that there is a British Layout with a ghosted tick in the box that can't be removed.
That is how it should be.
There's two other British Layouts one showing in Brackets (PC 105) and the next one down is British (PC 105 Alt) it will allow me to tick either of those two latter ones but when I untick them the ghosted British one still won't allow me to Tick it.
It doesn't matter, just untick those two PC layouts. Or you can check the box for Show Input Menu in Finder, so you can use the "flag" menu at the top right of the Finder to switch to plain British.
Anyhow as you see from another of my replies here I've found the result but imagine my frustration
I can certainly understand your frustration -- those non-Apple layouts cannot fit your keyboard and should never have been put on your machine, and no one trying to help would ever imagine that they could be on your machine without you putting them there either.