Ghost/core/server/helpers/meta_title.js

// # Meta Title Helper
// Usage: `{{meta_title}}`
//
// Page title used for sharing and SEO
var proxy = require('./proxy'),
    getMetaDataTitle = proxy.metaData.getMetaDataTitle;

// We use the name meta_title to match the helper for consistency:
module.exports = function meta_title(options) { // eslint-disable-line camelcase
    return getMetaDataTitle(this, options.data.root, options);
};