The product object contains information held against product record. 

The product object can be accessed in opportunity document layouts within the order.items  object:

{{ item.product.name }}

It may also be accessed in the product_assets  or container_item_assets  loop:

{% for asset in order.product_assets %}
  {{ asset.product.name }}
{% endfor %}

From product document layouts and discussion templates:

{{ product.name }}

Objects

View a list of objects on Google Sheets

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