setting meta tags for SEO

[jessie8808]

wonder if I can set the page title with a variable(not sure this term is right..) on product pages

for example in WordPress, you can set products page title like: %product_name% - %site_name%

and it automatically set the page title like: Product A name - example site

Is there any function like a snippet in WordPress in Shopify?

and even better if I can set it only on product pages..

[laemkevin]

BUMP
Interesting question

[KieranR]

Code it in liquid. Usually between <title> tags in themes.liquid 

Heaps of liquid string manipulation (filters) and control flow (if/then conditionals) available to make it behave the way you want. See this Liquid Cheat Sheet