What does it mean if there is no lock symbol in any browser while browsing to any HTTPS (SSL) websites?

If you do not see a lock symbol in your browser while visiting an HTTPS (SSL) website, it means that the website's SSL certificate is not trusted by your browser. SSL certificates are used to create a secure, encrypted connection between a web server and a client (usually a web browser). If the SSL certificate is not trusted, it means that the connection may not be secure, and any data transmitted between the web server and the client could potentially be intercepted by a third party.

There are several reasons why a browser might not trust an SSL certificate. For example, the certificate might have expired, the certificate might be self-signed (meaning it was not issued by a trusted certificate authority), or the website's domain name might not match the domain name listed in the certificate.

If you do not see a lock symbol while visiting an HTTPS website, it is recommended that you do not enter sensitive information (such as login credentials or credit card numbers) on the website, as it may not be secure. Instead, try to find an alternative website that does have a trusted SSL certificate.