How to Say "flagship" in Spanish
The Spanish word for “flagship” is “insignia” — B2 level.
English → SpanishB2
nounB2formal
the finest or most important item in a series or group

Examples
Este modelo es el producto insignia de nuestra compañía.
This model is our company's flagship product.
El Titanic era el buque insignia de la White Star Line.
The Titanic was the flagship of the White Star Line.
La tienda de Madrid es la tienda insignia de la marca.
The Madrid store is the brand's flagship store.
The 'Label' Use
When used after words like 'tienda' (store) or 'buque' (ship), it acts like a label. It stays feminine even if the first word is masculine (e.g., 'el buque insignia').
Agreement Error
Mistake: “Saying 'el buque insignio' because 'buque' is masculine.”
Correction: Say 'el buque insignia.' The word 'insignia' doesn't change its ending here.
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