jar
瓻 refers to a jar, specifically a type of earthenware vessel or pot.
瓻 combines 瓦 (earthenware) with 希, which likely contributes a phonetic element. The character is used for a type of jar or pot.
The left side 希 suggests something rare or precious, and the right side 瓦 means earthenware. Imagine a rare earthenware jar used to store valuable items.
For チ, picture a jar of tea (茶, ちゃ) but with a short, sharp 'chi' sound: chi -> チ. The jar holds a special tea blend.